75mm Reverse Magnifying Double Biconcave Real Glass Lens Reverse magnifying biconcave lens in 75mm diameter size Hard faux-wood casing with an insertion hole for an optional stand, rod or chain (not included) 75mm biconcave lens has a focal point of 200mm Popular amongst art buyers, film buffs, printers for layout work Made of real double concave glass. Weighs 3.2 oz